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參數(shù)資料
| 型號(hào)： | NCP1523 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 6-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TurboTrans |
| 中文描述： | 6甲，2.2 V至5.5 V輸入，非隔離，寬輸出，可調(diào)電源模塊的TurboTrans |
| 文件頁(yè)數(shù)： | 13/35頁(yè) |
| 文件大小： | 1128K |
| 代理商： | NCP1523 |
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CAPACITOR RECOMMENDATIONS FOR THE PTH04T230/231W POWER MODULE
Capacitor Technologies
Input Capacitor (Required)
The PTH04T231W requires a minimum input capacitance of 300
μ
F of ceramic type.
The PTH04T230W requires a minimum input capacitance of 330
μ
F. The ripple current rating of the electrolytic
capacitor must be at least 400 mArms. An optional 22-
μ
F X5R/X7R ceramic capacitor is recommended to
reduce the RMS ripple current.
Input Capacitor Information
PTH04T230W, PTH04T231W
SLTS271A–SEPTEMBER 2006–REVISED OCTOBER 2006
Electrolytic Capacitors
When using electrolytic capacitors, high-quality, computer-grade electrolytic capacitors are recommended.
Aluminum electrolytic capacitors provide adequate decoupling over the frequency range of 2 kHz to 150
kHz, and are suitable when ambient temperatures are above -20
°
C. For operation below -20
°
C, tantalum,
ceramic, or OS-CON type capacitors are required.
Ceramic Capacitors
The performance of aluminum electrolytic capacitors is less effective above 150 kHz. Multilayer ceramic
capacitors have a low ESR and a resonant frequency higher than the bandwidth of the regulator. They can
be used to reduce the reflected ripple current at the input as well as improve the transient response of the
output.
Tantalum, Polymer-Tantalum Capacitors
Tantalum type capacitors may only used on the output bus, and are recommended for applications where
the ambient operating temperature is less than 0
°
C. The AVX TPS series and Kemet capacitor series are
suggested over many other tantalum types due to their lower ESR, higher rated surge, power dissipation,
and ripple current capability. Tantalum capacitors that have no stated ESR or surge current rating are not
recommended for power applications.
The size and value of the input capacitor is determined by the converter’s transient performance capability. This
minimum value assumes that the converter is supplied with a responsive, low-inductance input source. This
source should have ample capacitive decoupling, and be distributed to the converter via PCB power and ground
planes.
Ceramic capacitors should be located as close as possible to the module's input pins, within 0.5 inch (1,3 cm).
Adding ceramic capacitance is necessary to reduce the high-frequency ripple voltage at the module's input. This
reduces the magnitude of the ripple current through the electroytic capacitor, as well as the amount of ripple
current reflected back to the input source. Additional ceramic capacitors can be added to further reduce the
RMS ripple current requirement for the electrolytic capacitor.
Increasing the minimum input capacitance to 680-
μ
F is recommended for high-performance applications, or
wherever the input source performance is degraded.
The main considerations when selecting input capacitors are the RMS ripple current rating, temperature stability,
and maintaining less than 100 m
of equivalent series resistance (ESR).
Regular tantalum capacitors are not recommended for the input bus. These capacitors require a recommended
minimum voltage rating of 2
×
(maximum dc voltage + ac ripple). This is standard practice to ensure reliability.
No tantalum capacitors were found to have voltage ratings sufficient to meet this requirement.
When the operating temperature is below 0
°
C, the ESR of aluminum electrolytic capacitors increases. For these
applications, OS-CON, poly-aluminum, and polymer-tantalum types should be considered.
13
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